<form action="{url}/useradmin/index{/url}" method="post" id="usersearch">
<p>
<label for="searchterm">{t}Search{/t}</label>
<input type="text" id="searchterm" name="searchterm" value="{$searchterm}"/>
</p>
<p>

<input type="submit" value="Search"/>

</p>
</form>